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题名: Trace-element transport during subduction-zone ultrahigh-pressure metamorphism: Evidence from western Tianshan, China
作者: Xiao, YY; Lavis, S; Niu, YL; Pearce, JA; Li, HK; Wang, HC(王厚成); Davidson, J
收录类别: SCIE ; EI
出版日期: 2012-07
刊名: GEOLOGICAL SOCIETY OF AMERICA BULLETIN
卷号: 124, 期号:7-8, 页码:1113-1129
出版者: GEOLOGICAL SOC AMER, INC
出版地: BOULDER
英文摘要: Subduction-zone metamorphism is considered to be a major chemical filter for both the arc magmatism and mantle compositional heterogeneity. To understand the element transport during this process, we conducted a petrographic and geochemical study of the bulk-rock blueschists and eclogites from the western Tianshan ultrahigh-pressure metamorphic belt, northwest China. By examining correlations among incompatible elements, we show that high field strength elements (HFSEs), rare earth elements (REEs), Th, and U are relatively immobile, whereas Pb and Sr are mobile in both basaltic and sedimentary protoliths during subduction-zone metamorphism. K, Rb, Cs, and Ba are mobile in rocks of basaltic protolith but immobile in rocks of sedimentary protolith because of the presence and persistent stability of white mica throughout their petrologic history. The commonly observed enrichment of some immobile elements (e.g., U, light [L] REEs) in arc magmas may thus not be caused by subduction-zone aqueous fluids. The lack of Rb/Sr-Sm/Nd correlation in these metamorphosed rocks is inconsistent with the observed first-order Sr-Nd isotope correlation in oceanic basalts, suggesting that the residual ocean crust that has undergone subduction-zone metamorphism cannot be the major source material for oceanic basalts, as widely believed, although it can contribute to mantle compositional heterogeneity in general.
作者部门: [Xiao, Yuanyuan ; Niu, Yaoling ; Davidson, Jon] Univ Durham, Dept Earth Sci, Durham DH1 3LE, England ; [Xiao, Yuanyuan ; Niu, Yaoling] Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China ; [Lavis, Shaun ; Pearce, Julian A.] Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3YE, S Glam, Wales ; [Li, Huaikun ; Wang, Huichu] Tianjin Inst Geol & Mineral Resources, Tianjin 300170, Peoples R China
通讯作者: Xiao, YY (reprint author), Univ Durham, Dept Earth Sci, Durham DH1 3LE, England.
学科分类: Geology
文章类型: Article
所属项目编号: Natural Environment Research Council (NERC) ; Royal Society China ; Chinese National Science Foundation (NSF) ; Chinese Geological Survey ; Higher Education Funding Council for England (HEFCE)/NERC ; Leverhulme Trust ; Durham University ; Chinese NSF [9101400, 41130314]
所属项目名称: 国家自然科学基金项目 ; 英国自然环境研究理事会项目
项目资助者: NSFC ; NERC
语种: 英语
DOI: 10.1130/B30523.1
ISSN号: 0016-7606
WOS记录号: WOS:000305872400006
EI记录号: 20123415368553
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/120609
Appears in Collections:地质科学与矿产资源学院_期刊论文

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Recommended Citation:
Xiao, YY,Lavis, S,Niu, YL,et al. Trace-element transport during subduction-zone ultrahigh-pressure metamorphism: Evidence from western Tianshan, China[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2012,124(7-8):1113-1129.
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